Draw a chart showing the crossing between red and white flowered pea plants till F2 generation. Find out the genotypic and phenotypic ratio of F2 generation. When the mating of black and white rats takes place, all the offspring produced in first generation are black. Why there are no white rats?​

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation:

i believe the correct answer is d

not sure but try c two haploid cells

explanation:

i believe the answer is c